[exFAT] Implement stat.

Aaru.Filesystems/exFAT/File.cs

@@ -0,0 +1,149 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : File.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Microsoft exFAT filesystem plugin.
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This library is free software; you can redistribute it and/or modify
+//     it under the terms of the GNU Lesser General Public License as
+//     published by the Free Software Foundation; either version 2.1 of the
+//     License, or (at your option) any later version.
+//
+//     This library is distributed in the hope that it will be useful, but
+//     WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+//     Lesser General Public License for more details.
+//
+//     You should have received a copy of the GNU Lesser General Public
+//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2026 Natalia Portillo
+// ****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using Aaru.CommonTypes.Enums;
+using Aaru.CommonTypes.Structs;
+using Aaru.Helpers;
+
+namespace Aaru.Filesystems;
+
+// Information from https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src/FileIO/exfat-specification.md
+/// <inheritdoc />
+public sealed partial class exFAT
+{
+    /// <inheritdoc />
+    public ErrorNumber Stat(string path, out FileEntryInfo stat)
+    {
+        stat = null;
+
+        if(!_mounted) return ErrorNumber.AccessDenied;
+
+        ErrorNumber errno = GetFileEntry(path, out CompleteDirectoryEntry entry);
+
+        if(errno != ErrorNumber.NoError) return errno;
+
+        stat = new FileEntryInfo
+        {
+            Attributes = new CommonTypes.Structs.FileAttributes(),
+            BlockSize  = _bytesPerCluster,
+            Length     = (long)entry.DataLength,
+            Inode      = entry.FirstCluster,
+            Links      = 1
+        };
+
+        // Calculate blocks
+        stat.Blocks = (long)(entry.DataLength / _bytesPerCluster);
+
+        if(entry.DataLength % _bytesPerCluster > 0) stat.Blocks++;
+
+        // Convert timestamps
+        stat.CreationTimeUtc = DateHandlers.ExFatToDateTime(entry.FileEntry.CreateTimestamp,
+                                                            entry.FileEntry.Create10msIncrement,
+                                                            entry.FileEntry.CreateUtcOffset);
+
+        stat.LastWriteTimeUtc = DateHandlers.ExFatToDateTime(entry.FileEntry.LastModifiedTimestamp,
+                                                             entry.FileEntry.LastModified10msIncrement,
+                                                             entry.FileEntry.LastModifiedUtcOffset);
+
+        stat.AccessTimeUtc = DateHandlers.ExFatToDateTime(entry.FileEntry.LastAccessedTimestamp,
+                                                          0,
+                                                          entry.FileEntry.LastAccessedUtcOffset);
+
+        // Set file attributes
+        if(entry.IsDirectory)
+            stat.Attributes |= CommonTypes.Structs.FileAttributes.Directory;
+        else
+            stat.Attributes |= CommonTypes.Structs.FileAttributes.File;
+
+        if(entry.FileEntry.FileAttributes.HasFlag(FileAttributes.ReadOnly))
+            stat.Attributes |= CommonTypes.Structs.FileAttributes.ReadOnly;
+
+        if(entry.FileEntry.FileAttributes.HasFlag(FileAttributes.Hidden))
+            stat.Attributes |= CommonTypes.Structs.FileAttributes.Hidden;
+
+        if(entry.FileEntry.FileAttributes.HasFlag(FileAttributes.System))
+            stat.Attributes |= CommonTypes.Structs.FileAttributes.System;
+
+        if(entry.FileEntry.FileAttributes.HasFlag(FileAttributes.Archive))
+            stat.Attributes |= CommonTypes.Structs.FileAttributes.Archive;
+
+        return ErrorNumber.NoError;
+    }
+
+    // ...existing code...
+    /// <param name="path">Path to the file or directory.</param>
+    /// <param name="entry">The directory entry if found.</param>
+    /// <returns>Error number.</returns>
+    ErrorNumber GetFileEntry(string path, out CompleteDirectoryEntry entry)
+    {
+        entry = null;
+
+        if(string.IsNullOrWhiteSpace(path) || path == "/") return ErrorNumber.IsDirectory;
+
+        string cutPath = path.StartsWith("/", StringComparison.Ordinal) ? path[1..] : path;
+
+        string[] pieces = cutPath.Split('/', StringSplitOptions.RemoveEmptyEntries);
+
+        if(pieces.Length == 0) return ErrorNumber.IsDirectory;
+
+        // Get parent directory
+        string parentPath;
+        string fileName;
+
+        if(pieces.Length == 1)
+        {
+            parentPath = "/";
+            fileName   = pieces[0];
+        }
+        else
+        {
+            parentPath = string.Join("/", pieces, 0, pieces.Length - 1);
+            fileName   = pieces[^1];
+        }
+
+        ErrorNumber errno =
+            GetDirectoryEntries(parentPath, out Dictionary<string, CompleteDirectoryEntry> parentEntries);
+
+        if(errno != ErrorNumber.NoError) return errno;
+
+        // Find the entry (case-insensitive per exFAT spec)
+        foreach(KeyValuePair<string, CompleteDirectoryEntry> kvp in parentEntries)
+        {
+            if(kvp.Key.Equals(fileName, StringComparison.OrdinalIgnoreCase))
+            {
+                entry = kvp.Value;
+
+                return ErrorNumber.NoError;
+            }
+        }
+
+        return ErrorNumber.NoSuchFile;
+    }
+}

Aaru.Filesystems/exFAT/Unimplemented.cs

@@ -29,7 +29,6 @@
 using System;
 using Aaru.CommonTypes.Enums;
 using Aaru.CommonTypes.Interfaces;
-using Aaru.CommonTypes.Structs;
 
 namespace Aaru.Filesystems;
 
@@ -45,10 +44,6 @@ public sealed partial class exFAT
         throw new NotImplementedException();
 
 
-    /// <inheritdoc />
-    public ErrorNumber Stat(string path, out FileEntryInfo stat) => throw new NotImplementedException();
-
-
     /// <inheritdoc />
     public ErrorNumber OpenFile(string path, out IFileNode node) => throw new NotImplementedException();